@article{
  author = {shoga, mehdi, hoseinzadeh lotfi, farhad, غلام ابری, امیر, Rashidi Komijan, Alireza},
  title = {Efficiency of 4 stage supply chain in presence of non discretionary ,  undesirable and negative factors Using SBM model in DEA},
  journal = {Economic  Modeling},
  year = {2020},
  volume = {14},
  issue = {51},
  pages = {73-98},
  doi = {10.30495/eco.2020.1899015.2357},
  url = {https://sanad.iau.ir/fa/Article/993527}
}